A) mass number reduces by 6
B) mass number reduces by 4
C) mass number reduces by 2
D) mass number remains unchanged
Correct Answer: B
Solution :
After one \[\alpha -\]emission, the mass number reduces by 4 and atomic number reduces by 2. Then, after two \[\beta \]-emissions the atomic number increases by 1 overall, the mass number reduces by 4 and atomic number remains unchanged.
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